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      javascript中的封装方法演变史
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        <p>昨天写了<strong><a href="/2018/03/12/javascript-inherit/">继承</a></strong>，今天总结一下<strong>封装</strong>的一些相关知识。</p>
<h3 id="1-先看一下什么是封装？"><a href="#1-先看一下什么是封装？" class="headerlink" title="1.先看一下什么是封装？"></a>1.先看一下什么是封装？</h3><p>我理解的封装就是把不同的属性和方法放入一个对象(或者叫抽象类)的过程。比如下面这样：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//这个是码农对象</span></span><br><span class="line"><span class="keyword">let</span> codingPeasant = &#123;</span><br><span class="line">    <span class="comment">//技能包</span></span><br><span class="line">    <span class="string">'skill'</span> : [] </span><br><span class="line">    <span class="comment">//职位</span></span><br><span class="line">    <span class="string">'job'</span> : <span class="string">''</span>, </span><br><span class="line">    <span class="string">'feature'</span> : [<span class="string">'加班多'</span>,<span class="string">'压力大'</span>]</span><br><span class="line">&#125;;</span><br></pre></td></tr></table></figure>
<p>像上面这样拥有<code>skill</code>、<code>job</code>、<code>feature</code>三个属性的对象就是我们封装好的一个对象，即码农对象。我们可以基于这个对象实例化出好多不同的对象，比如：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//前端</span></span><br><span class="line"><span class="keyword">let</span> cP1 = &#123;&#125;;</span><br><span class="line">cP1.skill = [<span class="string">'js'</span>,<span class="string">'css'</span>]; </span><br><span class="line">cP1.job = <span class="string">'frontEndDev'</span>; </span><br><span class="line">cP1.feature = [<span class="string">'加班多'</span>,<span class="string">'压力大'</span>]; </span><br><span class="line"><span class="comment">//后端</span></span><br><span class="line"><span class="keyword">let</span> cP2 = &#123;&#125;;</span><br><span class="line">cP2.skill = [<span class="string">'java'</span>]; </span><br><span class="line">cP2.job = <span class="string">'backEndDev'</span>; </span><br><span class="line">cP2.feature = [<span class="string">'加班多'</span>,<span class="string">'压力大'</span>];</span><br></pre></td></tr></table></figure>
<p>理论上我们已经基于codingPeasant对象实例化了cP1和cP2两个对象，但是如果要实例化多个对象，这样的写法就显得啰嗦，代码行数太多，而且目前我无法判断cP1与cP2之间的内在联系。</p>
<a id="more"></a>
<h3 id="2-提一个方法，批量生产"><a href="#2-提一个方法，批量生产" class="headerlink" title="2.提一个方法，批量生产"></a>2.提一个方法，批量生产</h3><p>改写封装的格式，提出一个方法来，可以明显减少代码行数，比如这样：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">codingPeasant</span>(<span class="params">skill,job,feature</span>)</span>&#123;</span><br><span class="line">    <span class="keyword">return</span> &#123;</span><br><span class="line">        <span class="string">'skill'</span>: skill,</span><br><span class="line">        <span class="string">'job'</span>: job,</span><br><span class="line">        <span class="string">'feature'</span>: feature,</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">//前端</span></span><br><span class="line"><span class="keyword">let</span> cP1 = codingPeasant([<span class="string">'js'</span>,<span class="string">'css'</span>],<span class="string">'frontEndDev'</span>,[<span class="string">'加班多'</span>,<span class="string">'压力大'</span>]);</span><br><span class="line"><span class="comment">//后端</span></span><br><span class="line"><span class="keyword">let</span> cP2 = codingPeasant([<span class="string">'java'</span>],<span class="string">'backEndDev'</span>,[<span class="string">'加班多'</span>,<span class="string">'压力大'</span>]);</span><br></pre></td></tr></table></figure>
<p>这样一来代码量明显下降了，直观上来看cP1和cP2是从一个方法实例化出来的，但还是无法判断他们之间的内在联系。</p>
<h3 id="3-JS构造函数的产生"><a href="#3-JS构造函数的产生" class="headerlink" title="3.JS构造函数的产生"></a>3.JS构造函数的产生</h3><p>为了解决上面提出的问题，javascript将普通<code>function</code>进行改造，在普通方法内引入了<code>this</code>变量，<code>new</code>一下改进后的方法就产生新的实例化对象，并且<code>this</code>指向了这个实例化对象，改造后的方法如下：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//方法内的this指向实例化对象</span></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">codingPeasant</span>(<span class="params">skill,job,feature</span>)</span>&#123;</span><br><span class="line">    <span class="keyword">this</span>.skill = skill,</span><br><span class="line">    <span class="keyword">this</span>.job = job,</span><br><span class="line">    <span class="keyword">this</span>.feature = feature,</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">//前端</span></span><br><span class="line"><span class="keyword">let</span> cP1 = codingPeasant([<span class="string">'js'</span>,<span class="string">'css'</span>],<span class="string">'frontEndDev'</span>,[<span class="string">'加班多'</span>,<span class="string">'压力大'</span>]);</span><br><span class="line"><span class="comment">//后端</span></span><br><span class="line"><span class="keyword">let</span> cP2 = codingPeasant([<span class="string">'java'</span>],<span class="string">'backEndDev'</span>,[<span class="string">'加班多'</span>,<span class="string">'压力大'</span>]);</span><br></pre></td></tr></table></figure>
<p>像上面那样进行封装的<code>function</code>就叫<strong>构造函数</strong>。使用构造函数实例化的对象都有一个<code>constructor</code>属性，指向构造函数本身，比如：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">console</span>.log(cP1.constructor); <span class="comment">//codingPeasant</span></span><br><span class="line"><span class="built_in">console</span>.log(cP2.constructor); <span class="comment">//codingPeasant</span></span><br></pre></td></tr></table></figure>
<p>这样我们就可以判断出cP1和cP2是由同一个构造函数实例化得到的，问题总算是解决了。但是仔细观察就会发现<code>codingPeasant</code>的<code>feature</code>属性值一直没有变，都是<code>[&#39;加班多&#39;,&#39;压力大&#39;]</code>，一直不变的量没有必要每次实例化都要赋值一次，能不能干脆写死，不用每次都赋值，这样也能提升效率，而且<code>cP1.feature == cP2.feature; //false</code>,这意味着两个完全相同的值占据者不同的存储空间，明显造成了<strong>内存浪费</strong>。</p>
<h3 id="4-prototype的产生"><a href="#4-prototype的产生" class="headerlink" title="4.prototype的产生"></a>4.<code>prototype</code>的产生</h3><p>为了解决上面提到的内存浪费，执行效率等问题，JavaScript在构造函数中引入了<code>prototype</code>属性，该属性指向一个第三方对象，且第三方对象的所有属性和方法都会被构造函数的实例化对象所继承。这样就可以把那些一直不变的属性绑定到这个第三方对象上，减少构造函数内部的代码量，实例化时执行效率升高，同时减少对内存的消耗，示例如下：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//把feature绑定到构造函数的prototype对象上</span></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">codingPeasant</span>(<span class="params">skill,job</span>)</span>&#123;</span><br><span class="line">    <span class="keyword">this</span>.skill = skill,</span><br><span class="line">    <span class="keyword">this</span>.job = job,</span><br><span class="line">&#125;;</span><br><span class="line">codingPeasant.prototype.feature = [<span class="string">'加班多'</span>,<span class="string">'压力大'</span>];</span><br><span class="line"><span class="comment">//前端</span></span><br><span class="line"><span class="keyword">let</span> cP1 = codingPeasant([<span class="string">'js'</span>,<span class="string">'css'</span>],<span class="string">'frontEndDev'</span>);</span><br><span class="line"><span class="comment">//后端</span></span><br><span class="line"><span class="keyword">let</span> cP2 = codingPeasant([<span class="string">'java'</span>],<span class="string">'backEndDev'</span>);</span><br></pre></td></tr></table></figure>
<p>此时<code>cP1.feature == cP2.feature; //true</code>,因为<code>feature</code>都存储到<code>prototype</code>对象上，内存节省了，执行效率也提高了，完美！！！</p>

      

      
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            缺失模块。<br/>1、请确保node版本大于6.2<br/>2、在博客根目录（注意不是yilia根目录）执行以下命令：<br/> npm i hexo-generator-json-content --save<br/><br/>
            3、在根目录_config.yml里添加配置：
<pre style="font-size: 12px;" q-show="jsonFail">
  jsonContent:
    meta: false
    pages: false
    posts:
      title: true
      date: true
      path: true
      text: false
      raw: false
      content: false
      slug: false
      updated: false
      comments: false
      link: false
      permalink: false
      excerpt: false
      categories: false
      tags: true
</pre>
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  	  		<div class="aboutme-wrap" id="js-aboutme">一个喜欢古风音乐和古诗词的前端&lt;br&gt;&lt;br&gt;&lt;br&gt;&lt;br&gt;雄关漫道真如铁&lt;br&gt;而今迈步从头越</div>
  	  	
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